From: Qiang Yu Date: Thu, 23 Jun 2022 02:43:03 +0000 (+0800) Subject: bus: mhi: host: Move IRQ allocation to controller registration phase X-Git-Tag: v6.6.17~6911^2~31^2~2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=1227d2a20cd7319fb45c62fab4b252600e0308bf;p=platform%2Fkernel%2Flinux-rpi.git bus: mhi: host: Move IRQ allocation to controller registration phase During runtime, the MHI endpoint may be powered up/down several times. So instead of allocating and destroying the IRQs all the time, let's just enable/disable IRQs during power up/down. The IRQs will be allocated during mhi_register_controller() and freed during mhi_unregister_controller(). This works well for things like PCI hotplug also as once the PCI device gets removed, the controller will get unregistered. And once it comes back, it will get registered back and even if the IRQ configuration changes (MSI), that will get accounted. Signed-off-by: Qiang Yu Reviewed-by: Jeffrey Hugo Reviewed-by: Manivannan Sadhasivam Link: https://lore.kernel.org/r/1655952183-66792-1-git-send-email-quic_qianyu@quicinc.com Signed-off-by: Manivannan Sadhasivam --- diff --git a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c index c137d55..bf672de 100644 --- a/drivers/bus/mhi/host/init.c +++ b/drivers/bus/mhi/host/init.c @@ -178,6 +178,12 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl) "bhi", mhi_cntrl); if (ret) return ret; + /* + * IRQs should be enabled during mhi_async_power_up(), so disable them explicitly here. + * Due to the use of IRQF_SHARED flag as default while requesting IRQs, we assume that + * IRQ_NOAUTOEN is not applicable. + */ + disable_irq(mhi_cntrl->irq[0]); for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { if (mhi_event->offload_ev) @@ -199,6 +205,8 @@ int mhi_init_irq_setup(struct mhi_controller *mhi_cntrl) mhi_cntrl->irq[mhi_event->irq], i); goto error_request; } + + disable_irq(mhi_cntrl->irq[mhi_event->irq]); } return 0; @@ -978,12 +986,16 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, goto err_destroy_wq; } + ret = mhi_init_irq_setup(mhi_cntrl); + if (ret) + goto err_ida_free; + /* Register controller with MHI bus */ mhi_dev = mhi_alloc_device(mhi_cntrl); if (IS_ERR(mhi_dev)) { dev_err(mhi_cntrl->cntrl_dev, "Failed to allocate MHI device\n"); ret = PTR_ERR(mhi_dev); - goto err_ida_free; + goto error_setup_irq; } mhi_dev->dev_type = MHI_DEVICE_CONTROLLER; @@ -1006,6 +1018,8 @@ int mhi_register_controller(struct mhi_controller *mhi_cntrl, err_release_dev: put_device(&mhi_dev->dev); +error_setup_irq: + mhi_deinit_free_irq(mhi_cntrl); err_ida_free: ida_free(&mhi_controller_ida, mhi_cntrl->index); err_destroy_wq: @@ -1026,6 +1040,7 @@ void mhi_unregister_controller(struct mhi_controller *mhi_cntrl) struct mhi_chan *mhi_chan = mhi_cntrl->mhi_chan; unsigned int i; + mhi_deinit_free_irq(mhi_cntrl); mhi_destroy_debugfs(mhi_cntrl); destroy_workqueue(mhi_cntrl->hiprio_wq); diff --git a/drivers/bus/mhi/host/pm.c b/drivers/bus/mhi/host/pm.c index dc2e8ff..4a42186 100644 --- a/drivers/bus/mhi/host/pm.c +++ b/drivers/bus/mhi/host/pm.c @@ -500,7 +500,7 @@ static void mhi_pm_disable_transition(struct mhi_controller *mhi_cntrl) for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { if (mhi_event->offload_ev) continue; - free_irq(mhi_cntrl->irq[mhi_event->irq], mhi_event); + disable_irq(mhi_cntrl->irq[mhi_event->irq]); tasklet_kill(&mhi_event->task); } @@ -1060,12 +1060,13 @@ static void mhi_deassert_dev_wake(struct mhi_controller *mhi_cntrl, int mhi_async_power_up(struct mhi_controller *mhi_cntrl) { + struct mhi_event *mhi_event = mhi_cntrl->mhi_event; enum mhi_state state; enum mhi_ee_type current_ee; enum dev_st_transition next_state; struct device *dev = &mhi_cntrl->mhi_dev->dev; u32 interval_us = 25000; /* poll register field every 25 milliseconds */ - int ret; + int ret, i; dev_info(dev, "Requested to power ON\n"); @@ -1117,9 +1118,15 @@ int mhi_async_power_up(struct mhi_controller *mhi_cntrl) mhi_write_reg(mhi_cntrl, mhi_cntrl->bhi, BHI_INTVEC, 0); } - ret = mhi_init_irq_setup(mhi_cntrl); - if (ret) - goto error_exit; + /* IRQs have been requested during probe, so we just need to enable them. */ + enable_irq(mhi_cntrl->irq[0]); + + for (i = 0; i < mhi_cntrl->total_ev_rings; i++, mhi_event++) { + if (mhi_event->offload_ev) + continue; + + enable_irq(mhi_cntrl->irq[mhi_event->irq]); + } /* Transition to next state */ next_state = MHI_IN_PBL(current_ee) ? @@ -1182,7 +1189,7 @@ void mhi_power_down(struct mhi_controller *mhi_cntrl, bool graceful) /* Wait for shutdown to complete */ flush_work(&mhi_cntrl->st_worker); - free_irq(mhi_cntrl->irq[0], mhi_cntrl); + disable_irq(mhi_cntrl->irq[0]); } EXPORT_SYMBOL_GPL(mhi_power_down);